#334D51
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.1% 0.032 208), rgb(51, 77, 81).
Aa
White text reads best on this color (9.04:1).
About this color
#334D51 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.032 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.009 away. White text reads best on it, at 9.04:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.04:1 |
Values
| HEX | #334D51 |
| RGB | rgb(51, 77, 81) |
| HSL | hsl(188, 23%, 26%) |
| OKLCH | oklch(40.1% 0.032 208) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #334D51 | 9.04:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #334D51 | 2.32:1 | Fails | Lc 13.2 | Not readable |
| #334D51 text on white | 9.04:1 | AAA | Lc 90.8 | Preferred for body text |
| #334D51 text on black | 2.32:1 | Fails | Lc -11.6 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D0DCDE
oklch(88.6% 0.013 208.8)
-
Step 300
300
#B0C5C9
oklch(80.9% 0.024 210.4)
-
Step 400
400
#85A8AD
oklch(70.7% 0.039 207)
-
Step 500
500
#669299
oklch(63.1% 0.049 208.4)
-
Step 600
600
#4C7C84
oklch(55.5% 0.053 209.1)
-
Step 700
700
#3D6970
oklch(49.2% 0.05 208.6)
-
Step 800
800
#33555B
oklch(42.6% 0.041 209.9)
-
Step 900
900 (this color)
#334D51
oklch(40.1% 0.032 208)
-
Step 950
950
#1B292C
oklch(27% 0.02 212.4)
#334D51 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #494B51 | 0.032 |
| Deuteranopia (no green cones) | #444751 | 0.029 |
| Tritanopia (no blue cones) | #284F4E | 0.016 |
| Achromatopsia (no color) | #494949 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #334D51
#334D51
oklch(40.1% 0.032 208)
- #58423E
#58423E
oklch(40.2% 0.032 30.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #334D51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.009
- Charcoal #264653 ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.035
- Deep Teal #00555A ΔE 0.039
- Dark Teal #014D4E ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.039
- Dark Blue Green #005249 ΔE 0.044
- Onyx #343A40 ΔE 0.061
Use #334D51 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.